Is AD 2020-21-13 a recurring Airworthiness Directive?

No — AD 2020-21-13 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2020-21-13 apply to?

AD 2020-21-13 applies to General Electric Company (Ge) — models GE90-110B1, GE90-115B, GE90. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2020-21-13

one-time

Official AD 2020-21-13 · FR doc 2020-22505 · 2020-10-13 · turbine engine

Airworthiness Directives; General Electric Company Turbofan Engines

What this AD requires

The FAA is adopting a new airworthiness directive (AD) for certain General Electric Company (GE) GE90-110B1 and GE90-115B model turbofan engines. This AD was prompted by the detection of melt-related freckles in the billet, which may reduce the life limits of certain high-pressure turbine (HPT) rotor stage 2 disks and certain rotating compressor discharge pressure (CDP) HPT seals. This AD requires the replacement of the affected HPT rotor stage 2 disks and rotating CDP HPT seals. The FAA is issuing this AD to address the unsafe condition on these products.

Which aircraft AD 2020-21-13 applies to

MakesGeneral Electric Company (Ge)

ModelsGE90-110B1, GE90-115B, GE90

Serial-conditional — narrows to serials TMT1BA38–TMT1BA38, TMT1BA41–TMT1BA41, GEE1H7GH–GEE1H7GH, GEE1H7JJ–GEE1H7JJ.

Part-conditional — 2505M73P03, 2479M03P01.

Applies only to engines with (1) HPT rotor stage 2 disk P/N 2505M73P03, S/N TMT1BA38 or TMT1BA41, installed; or (2) rotating compressor discharge pressure (CDP) HPT seal P/N 2479M03P01, S/N GEE1H7GH or GEE1H7JJ, installed.

Whether AD 2020-21-13 actually applies to your aircraft (by serial and installed parts) and whether it’s already complied with comes from that aircraft’s records.

How AD compliance is recorded

A valid compliance record (14 CFR 43.9) states:

Method of compliance — The specific action taken (inspected, replaced, modified) and to what revision.

Date — When the work was done.

Aircraft time — Total time in service / tach at compliance — how recurring next-due is computed.

Signature & certificate — The A&P/IA who returned it to service, with certificate number.

Is AD 2020-21-13 complied with on your aircraft?

Tailplate reads a tail number’s logbooks and matches every applicable AD — including this one — to its compliance evidence, with recurring next-due dates computed.

Look up a tail number →Read the full directive (Federal Register)

Applicability is derived from the FAA directive corpus and is advisory, not a legal airworthiness determination. Compliance is established only from an aircraft’s actual records.